The Trottenstrasse-breath

Do you know Trottenstrassen in Winterthur?
It is soooo steep. I need to climb this “city mountain” twice a day… with a bike… and a trailer… with a total of 28 kilo of humans in side (my two kids)… in (at the moment) 28+ degrees.
Whenever I (finally) get to the top, I stop, fill up my lungs completely, and then exhale with an “phwwww” out through my mouth to cope with the physical stress I’ve endured and to fully arrive at the top.